This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A309947 #14 Aug 27 2019 17:59:07 %S A309947 0,1,3,3,5,6,8,9,7,10,11,13,12,14,15,16,17,16,21,20,21,15,21,23,20,25, %T A309947 27,24,24,28,28,23,32,36,29,33,33,33,35,27,37,36,38,38,43,33,43,42,43, %U A309947 40,29,48,43,31,51,44,53,38,52,47,57,47,35,57,48,48,66,55,57 %N A309947 a(n) = A309891(A025487(n)): For each prime signature, gives the sum of the number of trailing zeros for all bases b >= 2 for some number m with that prime signature. The prime signatures are chosen in order in which they are first seen in the positive integers. %C A309947 A309891(n) only depends on the prime signature of n. This sequence lists the values for different prime signatures based on A025487 which lists the least positive integer for each prime signature. %e A309947 A309891(A025487(6)) = A309891(12) = 6. %Y A309947 Cf. A025487, A309891. %K A309947 nonn,easy %O A309947 1,3 %A A309947 _David A. Corneth_, Aug 24 2019